SSRS TextBox Background color - error

Hello all,

I got a textbox background colour expression as below

=IIF(Fields!Percent.Value >= IIF(Fields!JobTitle.Value="RKAE","4","6"),"GREEN","RED")

When the Percent Value is 3.6 its turning the cell into Green when ideally it should be red. I assume its just rounding off 3.6 to 4 and turning the cell green.

How can I avoid this problem ?

Thanks in advance !!